Midazolam acts synergistically with fentanyl for induction of anaesthesia.


The induction dose-response of midazolam was compared with the dose-response of its combination with fentanyl and with that of fentanyl alone in three groups of 60 unpremedicated, ASA physical status I or II women undergoing minor gynaecological surgery. The end-point of induction of anaesthesia was inability to open eyes upon command. Dose-response curves were determined for each group with a probit procedure and compared with an isobolographic analysis. Midazolam was found to act in synergism with fentanyl for induction of anaesthesia. Twenty-five percent of the ED50 of fentanyl was required in combination with 23% of the ED50 for midazolam to achieve the ED50 of the combination. This degree of synergism may explain mutual potentiation between opioids and benzodiazepines reported previously.

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@article{BenShlomo1990MidazolamAS, title={Midazolam acts synergistically with fentanyl for induction of anaesthesia.}, author={Izhar Ben-Shlomo and H abd-el-Khalim and J Ezry and Shmuel Zohar and M. G. Tverskoy}, journal={British journal of anaesthesia}, year={1990}, volume={64 1}, pages={45-7} }